Spark-plug.



W. s. BEGHTOLD.

SPARK PLUG.

APPLIOATION FILE'I) JUNE 24, 1909.

Patented Oct. 26, 1909 WILLIAM BECHTOLD, NEWARK, NEW JERSEY.

SPARK-PLUG.

Application filed J'une 24, 1909. Serial No. 504,027.

To all whom it may concern:

Be it known that I, WILLIAM S. BECH- TOLD, a citizen of the United States, and a resident of Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in SparktIjlugs, of which the following is a specificaion.

The invention relates to spark plugs such as are used in connection with internal combustion engines, and the like.

It has for its object to provide a plug which will not be so readily destroyed and whose perishable parts may be quickly and inexpensively replaced; also, to provide means for conveniently and readily advancing the sparking point after the several parts have been assembled. I attain these objects in the device illustrated in the accompanying drawings, in which Flgure 1 is an elevation of the improved spark plug. Fig. 2 is a plan view of the same. Fig. 3 is a vertical section of the spark plug; and Fig. 4 a view of the several parts 111 unassembled position.

Similar characters of reference designate corresponding parts throughout the several views. I

Referring now to the drawings, 10 designates a metallic socket of the plug, threaded so as to be screwed into the engine cylinder (not shown) and provided with a sparking terminal 11. The socket 10 is provided with an internal shoulder 12, and at its lower end with internal threads 13. lVithin this socketis arranged a tapered insulator l-i, preferably of porcelain and provided with a central longitudinal hole 15 and an enlargement 16. This insulator fits within the'said socket, the enlargement 16 abutting the shoulder 12 of the same through an intcr mediate packing ring 12. One end surface of the insulator 14 is recessed and receives a projection 17 of a supplementary insulator 18, )referably composed of fiber or other nonrittle insulatingmaterial. ln tbousuat construction of the insulator as onc 1)icoo,

breakage frequently occurs at about. the place .where l. have divided same; and, in making the supplementary portion of some non-brittle insulating material as tiber, breakage is almost entirely obviated. The upper portion of this supplementary insulator fits within the socket 10 and is provided with an enlargement 19. A bushing Specification of Letters Patent.

20 fits about the said supplementary insulator and screws into the said socket 10, a shoulder 21 of the, same abutting the enlargement l9 and drawing the supplementary insulator l8. firmly against the insulator 14 as the said bushing is screwed into the socket. The supplementary insulator is likewise provided with a central longitudinal hole 22 which registers with the hole 15, and through both of which passes the sparking pin 23. Theend of thissparking pin is provided with a head 21 arranged to abut against the inner end of a screw 25 passing through a terminal cap 26 which is screwed to the outer end of the supplementary insulator 18. The cap 26 is preferably locked to the supplementary insulator .18 as by driving a pm 27 through same. By adjustmg the screw 25 the sparkmg pin 23 may be advanced to suit the length of the sparkdesired and to allow for burning away of the said point. In case of breakage to the insulator, or carbonizing or other difliculties with the sparking point 23, the plug may be readily taken apart and the defective parts replaced.

I claim 1. In a spark plug: the combination with a socket, and a sparking terminal attached thereto; of an insulator fitting within said socket; a bushing screwed into said socket to hold said insulator in place; a sparking pin passing centrally through said insulator to coiipcrate with said sparking terminal; a terminal cap secured to the outer end of said insulator; and means passing through said cap to advance said sparking pin.

Patented Oct. 26, 1909.

2. In a spark plug: the combination with a. socket, and a sparking terminal attached 1 I passing centrally through said msulator to coiiperate with said sparking terminal, and a head at the outer end of said pin; a terminal rap secured to the outer end of said insu-. lator; and an adjusting screw passing therethrough and abuttingthe head of said sparking pin.

3. In a spark plug: the comhination with a socket, and a sparking terminal attached thereto, of an insulator titting within said socket; a bushing screwed into said socket to hold said insulator in place; a sparking pin passing centrally through said insulator to cooperate with said sparking terminal; a removable terminal cap secured to the outer end of said insulator; and means passing through said cap to advance said sparking pin.

1. in a spark plug: the combination with a socket, and a sparking terminal attached thereto; of an insulator fitting Within said socket; a supplementary insulator; a bushing about a portion of said supplementary insulator and screwed into said socket to hold said insulators in place; a sparking pin passing centrally tlirt said insulators to cooperate with said l 7 terminal. cap w" o H') the outer end of said mpplenientar insulator; and means passing through said cap to advance said sparking pin.

in a spark plug: the combination with socket and a spanking terminal attached thereto; of an insulator fitting Within said socket; a supplementary insulator; a. bushing about a portion of said supplementary insulator and screwed into said socket to sold said i? lators in place; a sparking pin rough said insulators to 1d sparking terminal; a io terminal cap secured to the outer tpleinentary insulator; and

arking terminal; a 1

ames means passing through said cap to advance said sparking pin.

6. In a spark plug: the combination With a socket, and a sparking terminal attached thereto; of an insulator fitting said socket, and an enlargement formed on the end of same and provided. with a recess; a supplementary insulator, and a rojection therefrom fitting said recess, an an enlargement formed on the inner end of the supplementary insulator; a removable bushing surrounding a portion of said supplementary insulator, and an internal shoulder thereon abutting said latter enlargement, said bushing being screwed into said socket to hold said insulators in place; a sparking pin passing central through said insulators to cooperate With the said sparking terminal; a terminal cap secured to the outer end of said supplementary insulator; and means passing through said cap to advance said sparking Signed at New York, in the county of New York and State of New York this 21 day of June A. D. 1909.

WlLLlAM S. BECHT'OLD. Vw'itnesses linnon Semi A. F. Emmanuel-r1. 

